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From KQED in San Francisco, I'm Alexis Madrigal.

During the early white-hot months of his administration, Donald Trump instituted a new policy to separate families detained at the U.S. border.

Protests erupted declaring it cruel and un-American.

But the policy of immigrant detention in the U.S. is far from new.

It's been used on Jews fleeing Nazi Germany, migrants from civil wars in Central America,

and immigrants from around the world since the policy was codified in 1891.

Stanford professor, Anna Raquel Minion, will take us through this history,

which is the subject of her new book, in the Shadow of Liberty.

She's coming up next after this news. Welcome to Forum. I'm Alexis Madrigal.

The American immigration system did not develop in some rational way.

Instead, government officials and judges in the last 150 years have made a series of decisions

that have led to some Byzantine and seemingly un-American situations.

...